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螺旋圓桶紙管的卷紙角R和紙帶寬度L及紙管內徑Φ的計算關系 |
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小黑屋|手機版|Archiver|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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